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How Trump Won—and How the GOP Let Him

With his victory in Indiana, Donald Trump has seized a controlling stake in the Republican Party.

Presumptive Republican Nominee Donald Trump will have to change the electoral map in order to defeat his likely Democratic competitor, Hillary Clinton, in the general election. WSJ's Shelby Holliday explains which states are in play in 2016. Photo: Getty

Back when few people took Donald Trump seriously as a potential presidential candidate, the New York businessman asked former House Speaker Newt Gingrich and his wife, Callista, to meet in Iowa. Over breakfast at the Des Moines Marriott Hotel in January 2015, Mr. Trump spent 45 minutes grilling Mr. Gingrich on his experience running for president.

“It was clear to me at the end of the talk that he was seriously considering it,” Mr. Gingrich said.